High-efficiency flyback grid-connected photovoltaic inverter
A technology of flyback transformer and flyback converter, which is applied in the direction of photovoltaic power generation, high-efficiency power electronic conversion, and conversion of AC power input to AC power output, etc. It can solve the problems of wasting leakage inductance energy and reducing system efficiency
Active Publication Date: 2011-05-18
上海英孚特电子技术有限公司 +1
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Problems solved by technology
The flyback inverter has the characteristics of simple structure and high reliability, and is used as a typical circuit structure in micro grid-connected inverters. Due to the leakage inductance in the traditional flyback inverter, when the main power tube is turned off, a The peak voltage is generally absorbed by the RCD circuit, and finally the leakage inductance energy is consumed through the resistor, which can prevent the generation of the peak voltage and ensure the safety of the power switch tube. However, the RCD absorption circuit wastes the leakage inductance energy and reduces the system efficiency.
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[0017] Preferred embodiments of the present invention are described in detail as follows in conjunction with accompanying drawings:
[0018] A high-efficiency flyback photovoltaic grid-connected inverter, including a high-frequency flyback converter 1, a power frequency converter 2, a low-pass filter 3, a leakage inductance recovery circuit 4 and a switching tube control unit 5. It is characterized in that the high-frequency flyback converter 1 converts the direct current of the photovoltaic cell into a high-frequency steamed wave current and outputs it to the power frequency converter 2, and the power frequency converter 2 converts the high-frequency steamed wave current into The high-frequency alternating current is output to the low-pass filter 3, and the low-pass filter 3 filters the high-frequency current and merges it into the power grid, and the leakage inductance recovery circuit 4 converts the leakage inductance energy of the high-frequency flyback transformer After b...
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The invention discloses a flyback grid-connected photovoltaic inverter, belongs to the technical field of solar grid-connected photovoltaic power generation, and is in particular suitable for a module-integrated photovoltaic building system. Leakage inductance energy of a flyback inverter is absorbed through a leakage inductance recovery circuit, and the energy stored in the leakage inductance recovery circuit is fed back to the output by a control unit through a high-frequency transformer so as to recycle the leakage inductance energy. Nondestructive absorption of the leakage inductance energy can be realized, a sinusoidal waveform of output current of a grid-connected inverter is not influenced, the soft switching action of the flyback inverter can be realized, and the system efficiency can be effectively improved.
Description
Technical field: [0001] The invention belongs to the technical field of solar grid-connected power generation, and in particular relates to a high-efficiency flyback photovoltaic grid-connected inverter. Background technique: [0002] With the increase of energy demand, countries around the world are actively developing clean and renewable new energy sources in order to meet the requirements of sustainable human development. Solar power has the advantages of being inexhaustible, inexhaustible, and free from environmental pollution. It is considered by global energy experts to be the most promising green energy. Photovoltaic grid-connected inverter is the core part of the photovoltaic power generation system, and its efficiency directly affects the performance and investment of the entire system. In traditional photovoltaic power generation systems, photovoltaic modules are connected in series and parallel to form a photovoltaic array, which is carried out through a centraliz...
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Login to View More IPC IPC(8): H02M5/458H02J3/38
CPCY02E10/563Y02B10/14Y02B70/1491Y02A30/60Y02B10/10Y02B70/10Y02E10/56
Inventor 吴春华杨宇徐坤
Owner 上海英孚特电子技术有限公司